Lawn mower grinding device



FIG. 1 is a front, top perspective view of a lawn mower grinding device, showing my new design;

FIG. 2 is a rear, bottom perspective view thereof;

FIG. 3 is a rear, top perspective view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is a right side view thereof;

FIG. 8 is a top plan view thereof; and,

FIG. 9 is a bottom plan view thereof.

The dashed broken lines in the figures are for the purposes of illustrating portions of the lawn mower grinding device, which form no part of the claimed design. 

CLAIM The ornamental design for a lawn mower grinding device, as shown and described. 